164 Recent Literature. [j a u n k 



authorship of the present paper has apparently resulted in a more equable 

 treatment of the problem than has yet been presented. 



The important facts are brought forcibly to our attention that we must 

 not look for all or even a majority of " indicators " in any one locality 

 since other conditions limit the range of most species within their zone. 

 Moreover, a thoroughly typical species may occur outside of its zone as a 

 straggler without lessening its value as an " indicator " of the zone — 

 in other words the abundance of the species must be taken into considera- 

 tion as well as its mere presence. 



We trust that ere long we may have an authoritative list of zone " indi- 

 cators " for other regions besides the Pacific coast. — ■ W. S. 



Dabbene on Argentine forms of the Genera Geositta and Cin- 

 clodes. 1 — In this important systematic paper, Dr. Dabbene has carefully 

 reviewed the Argentine species and subspecies of these two genera, giving 

 full descriptions of the plumage of each, an apparently complete synonymy, 

 tables of measurements of specimens examined, and keys for identification. 

 There are also half-tone plates illustrating the habitats of some of these 

 birds in the mountain regions of north-western Argentina and maps show- 

 ing their geographic distribution. 



By the careful work of Dr. Dabbene and his associates we are obtaining 

 a thorough knowledge of the Argentine avifauna such as can only be sup- 

 plied by capable resident ornithologists. We congratulate them upon the 

 admirable results of their studies and hope that their researches may con- 

 tinue without interruption. — W. S. 



Cory's ' Review of the Genera Siptornis andCranioleuca.' 2 — After 

 examining all of the species of the old genus Siptornis that were available 

 Mr. Cory has presented a key to the genera into which he would divide the 

 group and another key to the species and subspecies. As an aid to the 

 identification of these difficult birds it will be of much assistance but from 

 the tentative position to which he refers a number of species that he was 

 unable to examine, it is evident that there is still much to be learned about 

 the group. 



According to the author's views the old name Siptornis must be restricted 

 to the type species, and most of the others referred to Cranioleuca Reichb. 

 S. ottonis however, he makes the type of a new genus Pseudosiptornis (p. 

 150), while S. flammulata becomes the type of another new genus Siptor- 

 noides (p. 150) which includes ten other species. Some of these however, 

 are separated again under the subgeneric name Easiptornoidcs (p. 150) 

 type S. anthoides. 



1 Las Especies y Subespecies Argent inas de los Generos Geositta Swainson y Cinclodes 

 Gray. Por Roberto Dabbene. Ann. del Mus. Nac. de Hist. Nat. de Buenos Aires. Torn. 

 XXX, pp. 113-196. July 11, 1919. 



2 A Review of Reichenbach's Genera Siptornis and Cranioleuca, with Descriptions of New 

 Allied Genera and a Subgenus. By Charles B. Cory. Proc. Biol. Soc. Washington, Vol. 

 32, pp. 149-160. September 30, 1919. 



